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Finding the Fourth Proportional to 1,109.84, 1,531.74 and 668

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Solution

The fourth proportional to 1,109.84, 1,531.74 and 668 is: 921.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.84 : 1,531.74 = 668 : x
  2. Step 2: Convert to fraction form
    1,109.84/1,531.74 = 668/x
  3. Step 3: Cross multiply
    1,109.84x = 1,531.74 × 668
  4. Step 4: Simplify right side
    1,109.84x = 1,023,202.32
  5. Step 5: Solve for x
    x = 1,023,202.32/1,109.84
  6. Step 6: Final answer
    x = 921.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.